Tau is approximately equal to 6.28, so that makes today, 6/28, Tau day! Happy Tau Day.
One easy way to think of Tau Day is just to eat twice as much pie today as you did on Pi Day (March 14).
What is Tau? In 2001, Bob Palais published the article “π Is Wrong” in which he argued that the beloved constant π is the wrong choice of circle constant. He instead proposed using an alternate constant equal to 2π, or 6.283… to represent “1 turn”, so that 90 degrees is equal to “a quarter turn”, rather than the seemingly arbitrary “one-half π”.
from Kahn Academy
Does that clear it up for you? No? Me neither! I’m totallly confused to. Let’s check in with Vi Hart for some help.
Tau from Vi Hart
What Tau Sounds Like: A Musical Intrepretation of Tau
Michael Blake, a musician, interprets the mathematical constant Tau to 126 decimal places.
p.s. And get excited for 2015, just one year away, when we will celebrate 3/14/15 9:26:54, both AM and PM, the only two moments in an entire century represented by pi’s first ten digits. From From the Mixed Up Files of Middle Grade Authors